JP4045247B2 - Integrated air conditioner - Google Patents

Description

  The present invention relates to an integrated air conditioner.

  On the indoor side of a conventional integrated air conditioner, an indoor heat exchanger is arranged at the center of the front of the unit, a centrifugal fan such as a sirocco or a turbo fan is arranged downstream of this, and the outlets are on both sides of the indoor heat exchanger. Is arranged. That is, as described in Patent Document 1 and Patent Document 2, an air suction port is provided on the front surface of the integrated air conditioner so as to face the indoor heat exchanger, and the air sucked from the air suction port. Was sucked into the centrifugal fan via the indoor heat exchanger, and then blown out from the air outlets provided on both sides of the air inlet through the air passage.

Japanese Utility Model Publication No. 53-157549

JP 11-325505 A

  The integrated air conditioner according to the above prior art has a square-shaped suction inlet on the front side when viewed from the indoor front, although the unit width cannot be increased and is originally narrow. A vertical oblong air outlet was provided. For this reason, in order to obtain a predetermined air volume that secures the necessary heat exchange amount, the pressure loss of the heat exchanger is large, and thus a high-pressure fan (sirocco fan) has to be used. As a result, there is a problem that the noise of the fan is high, and further, there is a problem that COP (coefficient of performance = capacity / electrical input) is poor due to high fan motor input and high unit power consumption.

  This is because, as an indoor fan, a multiblade fan with a large inner diameter with blades capable of outputting high airflow and high pressure tilted greatly in the rotational direction was used, so the blowout speed at the fan outlet was high and the loss at the blowout outlet was low. This is because the air outlets provided on both sides of the front of the unit cannot be made small, and the width of the indoor heat exchanger cannot be inevitably increased.

  In addition, since the blowing speed of the blowout port is slow, this problem has occurred such that the cool air does not reach the entire room, the room temperature is uneven, and the time to reach a predetermined temperature is long.

  That is, if the width of the indoor heat exchanger is widened in order to improve the heat exchange performance of the indoor heat exchanger, the width of the air outlet is reduced and noise increases, and conversely, the width of the air outlet is reduced in order to reduce noise. When widened, there is a problem that the width of the indoor heat exchanger decreases and the heat exchange performance deteriorates.

  An object of the present invention is an integrated air conditioner having an air inlet on the front of the unit and air outlets on the left and right of the air inlet, and has heat exchange performance while reducing noise, which is the above-mentioned conflicting event. The object is to provide an integrated air conditioner.

  The above objects are provided in the compressor, the outdoor heat exchanger, the indoor heat exchanger, the outdoor fan, the air inlet provided in the front of the unit, and the right and left of the air inlet. In an integrated air conditioner having an air outlet, the width of the fin portion of the indoor heat exchanger is provided so as to face the air suction port, and has U-bends at both ends and fins at portions sandwiched between the U-bends. This is achieved by setting the unit width to 0.60 to 0.75.

  In addition, the object is to provide a compressor, an outdoor heat exchanger, an indoor heat exchanger, an outdoor fan housed in the unit, an air inlet provided in front of the unit, and left and right of the air inlet. In the integrated air conditioner having an air outlet, the full width of the indoor heat exchanger is provided so as to face the air suction port, and has U-bends at both ends and fins at portions sandwiched between the U-bends. This is achieved by setting the unit width to 0.70 to 0.85.

  According to the present invention, in an integrated air conditioner having an air inlet on the front of the unit and air outlets on the left and right of the air inlet, an integrated air conditioner having heat exchange performance while reducing noise is provided. can do.

  FIG. 1 shows an embodiment of the present invention. A unit base 1 on which the components of the integrated air conditioner are placed, and these components are covered by a cabinet 2. The outdoor partition wall 6 partitions the discharge space and the suction space, and the outdoor mouth ring 3 is provided as a suction port. The discharge space is a space surrounded by the outdoor partition wall 6 and the outdoor heat exchanger 5, and air from the outdoor fan 4 provided downstream of the outdoor mouth ring 3 is discharged into the discharge space. Upstream of the outdoor fan 4, a compressor 8, a suction tank 7, and a fan motor 11 for driving the outdoor fan 4 and the indoor fan 12 on both shaft axes are arranged. The fan motor 11 is fixed to the unit base 1 by a fan motor support 10. When the outdoor fan 4 rotates, air is sucked in from the room where the compressor 8 is located, and passes through the outdoor heat exchanger 5 installed downstream of the outdoor fan 4 to release heat to the outside.

  A front grille 19, a filter 15, and an indoor heat exchanger 21 are provided on the indoor side of the inner and outer partition walls 9. There is a suction casing 20 that also serves as a part of the indoor casing 17 that guides the air from the indoor heat exchanger 21 to the indoor fan 12, and the air sucked from the indoor mouth ring 13 is sent from the indoor fan 12 and the fan. A nose 22 for diverting the current flow to both sides of the unit and a downstream wind direction plate 16 and a vertical wind direction plate 18 are mounted downstream thereof.

  When the indoor fan rotates, air is sucked through the front grille 19 and the filter 15 and is absorbed by the indoor heat exchanger 21, and is divided by the plurality of noses 22 and the indoor casing 17 that determine the blowout flow downstream of the fan, and the indoor heat exchanger. The cool air is blown out indoors from the air outlets 14 on both sides. The indoor heat exchanger 21 is composed of a portion having fins that mainly perform heat exchange in the central portion and pipes through which refrigerant flows, and both sides thereof are formed by U-bend portions 23 to which the pipes return. The width of the fin part is Wexf, and the width of the fin part and the entire U-bend part is Wex. In the integrated air conditioner, the air sucked from the air suction port on the front side on the indoor side is heat-exchanged through the width Wexf of the fin portion of the entire width Wex of the indoor heat exchanger 21 and sucked into the indoor fan 12. Be turned. And it has the structure which blows off the air which was air-conditioned into the room | chamber interior from the blower outlet 14 provided in the both outer sides of the indoor heat exchanger 21, and the both sides of the air suction port of the unit front.

  Although not shown, a dew receiver that receives condensed water and a water conduit that guides the dew receiving water to the lower outside of the unit 1 are provided at the lower portion of the indoor heat exchanger 21.

  As described above, the structure of the indoor heat exchanger is composed of fins and pipes that are in close contact with the fins, and U-bends at both ends of the fins for returning the pipes in layers. For this reason, the fin part sandwiched between both ends by U-bends is a substantial heat exchange part, and the U-bend parts at both ends hardly contribute to heat exchange compared to the fin part. The unit width of many integrated air conditioners is 470 mm to 660 mm (varies depending on the cooling capacity), and the fin width of the indoor heat exchanger is 270 mm for the former and 375 mm for the latter, and substantially exchanges heat with respect to the unit width. The ratio of the parts is approximately 0.57.

  The total width of the indoor heat exchanger including the U-bends on both sides of the fins is the width of the fins plus the lengths of the U-bends on both sides. The former is 330 mm, the latter is 435 mm (ratio to the unit width is 0.7 to 0.00 66) or so.

  This is because the front mounting area of the indoor heat exchanger is increased to ensure the amount of heat exchange, and if the front surface area of the heat exchanger is increased in the width direction, the outlets on both sides of the unit are narrowed. The required pressure of the fan for rapidly increasing the speed increases, and as a result, the dimensions are determined based on concerns about noise and an increase in power consumption due to an increase in fan input.

  However, this structure has the following problems. Despite the fact that the unit width is originally small, the front area of the indoor heat exchanger fins is as small as 0.57 as described above with respect to the unit width. Due to the large pressure loss of the heat exchanger, high pressure fans (sirocco fans) must be used. As a result, there is a problem that the noise of the fan is high, and further, there is a problem that the COP is bad because the input of the fan motor is high and the unit power consumption increases.

  FIG. 2 is a front view of the unit of this embodiment, and shows the relationship between the unit width Wu, the width Wexf and Wex of the heat exchanger, the outlet width Bd of the outlet, and the unit height direction. In this embodiment, the electric component 24 for operating the unit is provided at the lower part of the unit. The unit has a width Wu and a height HU, the heat exchanger has a width Wexf, Wex, a height Hex, and the outlet has a rectangular shape with a width Bd and a height Hd.

  Therefore, it is necessary to determine the balance between the pressure loss of the heat exchanger and the pressure loss of the outlet (dynamic pressure for blowing) in consideration of the characteristics of the fan. That is, if the heat exchange amount is increased by increasing the widths Wexf and Wex of the indoor heat exchanger 22, the speed from the outlet 14 increases, and the dynamic pressure increases rapidly, exceeding the fan pressure increase. This means that no air flows.

  Further, if the outlet width Bd of the outlet 14 is increased in order to reduce the dynamic pressure of the outlet and further the loss of the wind direction plate, the width of the indoor heat exchanger 22 becomes smaller, and the heat loss increases as the pressure loss of the heat exchanger increases. There arises a problem that the exchange amount cannot be secured.

  Further, in order to secure the air volume, it is necessary to increase the number of rotations of the fan, which leads to a significant increase in noise and an increase in power consumption due to a rapid increase in fan motor input, which is not preferable in terms of power saving.

  In other words, in the integrated air conditioner, there is an optimum value between the width Wexf or Wex of the indoor heat exchanger and the width of the outlet, which can maximize the air volume and maximize the heat exchange amount.

  FIG. 3 is a diagram showing the effect in the present embodiment. When the unit noise is a conventional value and the heat exchanger fin width (Wex) is changed with respect to the unit width (Wu), the air volume changes, This is an examination of changes in energy consumption efficiency (generally referred to as COP) with respect to unit capacity (the stated values are particularly when the capacity is constant in the case of 1.5 HP models or more). Specifically, numerical values were derived through experiments and simulations. The conventional maximum value of the heat exchanger fin width is about Wexf / Wu = 0.57, and COP at this point is shown as COP = 1.0. A centrifugal fan (turbo fan) is used as the fan, which has a lower absolute speed at the impeller exit than the sirocco fan (the impeller exit angle is approximately within β2 = 130).

  As a result, when the width of the heat exchanger is larger than Wexf / Wu = 0.60, which is larger than the conventional maximum value, the capacity improvement increases, and when the width becomes 0.75 or more, it rapidly decreases. When Wexf / Wu is 0.75 or more, the capacity drops sharply as the Wexf / Wu increases, the outlet becomes relatively narrow, and the dynamic pressure and the wind direction plate loss increase to increase the outlet wind speed. is there. Theoretically, when Wexf / Wu = 1.0, there is no blowout area and no airflow is generated, so COP = 0.

  On the other hand, the smaller Wexf / Wu, the lower the heat transfer area of the heat exchanger and the rapid increase of the pressure loss of the heat exchanger. When Wexf = 0, the air volume is 0, so COP is 0.

  From the above, it can be seen that the condition for securing a conventional COP ratio of 1 or more is that the heat exchanger fin width (Wexf) with respect to the unit width (Wu) is in the range of Wexf / Wu = 0.60 to 0.75. .

  In an air conditioner, it is important to improve COP by 1% or more, and because this is a COP improvement only with fan performance and heat exchanger mounting condition, this result does not cause a significant increase in cost. Is important for power saving. In that sense, the optimum Wexf / Wu that can improve the COP by 1% or more from the current situation may be set from 0.625 to 0.7, and the ultimate optimum value may be considered from 0.65 to 0.7. .

  The above effects can be obtained only by the heat transfer area of the heat exchanger and the fan and the fan air volume when the noise is constant, so that it does not cause a significant increase in cost and the development period can be shortened. .

  Therefore, in the integrated air conditioner, the noise aspect should be that the width (Wexf) of the heat exchanger fins should be in the range of 0.60 to 0.75 relative to the unit width or more optimal as described above. In addition, it is possible to expect effects such as unit cycle efficiency, and further that the width (Bd) of the blowout port can be made smaller than before, so that the blowout wind speed increases and the cold wind spreads throughout the room and comfort is increased.

  As described above, according to this embodiment, in the integrated air conditioner, the mounting width of the heat exchanger within the limited unit width is optimal in relation to the blowing dynamic pressure at the outlet of the outlet. By increasing the size, the air volume can be increased by 10% or more compared to the conventional case, and the air volume can be increased at the same noise level, the indoor heat exchange amount can be increased, and the power can be reduced. In addition, as a result of the above, it is possible to increase the blowing speed by narrowing the outlet width of the blowing port so that the cold air reaches the entire room so that the room temperature from the start of operation becomes a predetermined value. It is possible to prevent temperature unevenness throughout.

  The above shows the optimum value of the width (Wexf) of the heat exchanger fin part, but the actual heat exchanger has U-bend parts 23 of the pipes on both sides of the fin part as shown in FIG. The part has little heat exchange effect, but is necessary for mounting. The width (Bd) of the outlet is also determined by the dimension obtained by adding the width (Wex) of the fin portion and the width (Bd) of the U-bend portions on both sides. From the above actual values, the width of the U-bend part is 22% to 16% of the fin part width (Wexf) and 13% to 9% of the unit width. The optimum value is slightly higher than the above-mentioned optimum value, and Wex / Wu = 0.70 to 0.85. That is, when the horizontal axis of FIG. 3 is considered with the full width of the heat exchanger, the width ratio that can improve the exchange heat amount from the conventional range may be considered as Wex / Wu = 0.70 to 0.85. .

  The optimum value of the total width of the heat exchanger, including this U-bend, is also the optimum range where the energy consumption efficiency (COP) is higher, like the optimum value of the width (Wexf) of the heat exchanger fins. it is obvious.

  As described above, when the width of the heat exchanger with respect to the unit width is set to the optimum range, the wind speed from the outlet increases, and the indoor temperature distribution and the predetermined temperature arrival time can be shortened. The present embodiment is intended to further enhance the effect.

  The conventional outlet is on the front of the unit, and the cool air is blown out on the front of the unit. On the other hand, the modification of the outlet shown in FIG. 4 expands the outlet 14 on the side of the unit. In accordance with the swing of the wind direction plate 18, cold air is blown to both sides of the unit. If the blower outlet 14 is expanded on both sides of the unit, the wind speed of the blower outlet 14 is relaxed, and the capability can be improved by further increasing the air volume. Since the front decorative frame is generally curved, it is desirable that the dimension (Dd) used for enlargement be 20% or more of the width (Bd) of the outlet.

  As a result, the following effects are obtained with respect to the indoor temperature distribution. In other words, when the blowout port is enlarged on the side of the unit and the cold air is blown out to the both side surfaces with the wind direction plate, the blowout port is larger than the conventional one, so that the cold air can be blown into the entire room without increasing the loss of the wind direction plate. Or it becomes possible to cool a wall and the effect of a radiation cooling is also produced at the time of steady state.

  The shape of the indoor fan 12 will be described with reference to FIG. As the indoor fan 12, the outer diameter of the core plate (shroud) 26 is smaller than the inner diameter of the side plate (hub) 25, and the outer diameter of the blade (blade) 24 is gradually decreased from the side plate 25 side to the core plate 26 side. The fan motor input can be reduced by 10% or more compared to the case where the diameter of the blade 24 is constant in the axial direction. The energy consumption efficiency (COP) shown in FIG. 3 is further improved by adopting the above-described indoor heat exchanger mounting form and the example of the air outlet.

  In addition, although the said Example demonstrated the integrated air conditioner which has a blower outlet on either side of an indoor heat exchanger, there exists an effect, if there exists a blower outlet other than these blower outlets.

  As described above, according to the present embodiment, since the mounting area of the heat exchanger can be mounted to the maximum within a limited unit width, when the capacity is constant, the cooling feeling is improved by reducing the power consumption and increasing the air volume. Is possible. In addition, there is an effect that it is possible to realize resource minimization, cost reduction, and weight reduction by reducing fan motor input.

The plane sectional view of the integrated air conditioner which is one example of the present invention. The front view of the integrated air conditioner concerning FIG. The figure which shows the relationship between the width | variety of an indoor fan, and COP. The figure which shows the modification of the air blower outlet of an integrated air conditioner.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Unit base, 2 ... Cabinet, 3 ... Outdoor mouth ring, 4 ... Outdoor fan, 5 ... Outdoor heat exchanger, 6 ... Outdoor partition, 7 ... S tank, 8 ... Compressor, 9 ... Inner / outer partition, 10 ... Fan motor support, 11 ... fan motor, 12 ... indoor fan, 13 ... indoor mouth ring, 14 ... outlet, 15 ... filter, 16 ... lateral wind direction plate, 17 ... indoor casing, 18 ... vertical wind direction plate, 19 ... Front grille, 20 ... suction casing, 21 ... indoor heat exchanger, 22 ... nose, 23 ... driving operation part, 24 ... vane, 25 ... side plate, 26 ... mandrel.

Claims (4)

  A compressor housed in the unit, an outdoor heat exchanger, an indoor heat exchanger, an outdoor fan, an air inlet provided in front of the unit, and air outlets provided on the left and right of the air inlet. In the integrated air conditioner, the width of the fin portion of the indoor heat exchanger, which is provided facing the air suction port and has U-bends at both ends and fins sandwiched between the two, is defined as the unit width. An integrated air conditioner from 0.60 to 0.75.   The integrated air conditioner according to claim 1, wherein an air outlet is enlarged on the front side surface of the unit.   A compressor housed in the unit, an outdoor heat exchanger, an indoor heat exchanger, an outdoor fan, an air inlet provided in front of the unit, and air outlets provided on the left and right of the air inlet. In the integrated air conditioner having the entire width of the indoor heat exchanger provided opposite to the air suction port, having U-bends at both ends and fins sandwiched between the two, is 0.70 of the unit width. Integrated air conditioner from 0.85. 4. The integrated air conditioner according to claim 3, wherein an air outlet is enlarged on the front side surface of the unit.

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